我是一名平面设计师，只是学习SVG动画图标和编码。我在Illustrator中画了一杯咖啡，然后将其导出为SVG文件。我正在尝试对蒸汽进行动画处理，使其像真实的蒸汽一样上升。问题是，即使我在CSS中选择了.steam1 .st1，它也没有使Steam动画。我可能一直对我一直在看的大量教程感到困惑。有人可以看一下我的HTML代码来查看插图，并根据此代码使用CSS来帮助我对其进行动画设置http://codepen.io/anon/pen/DLmCn
这是我在HTML中的SVG代码http://codepen.io/anon/pen/niHCA
<body>
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<path class="st1" d="M39.1,20.8c0,0-0.2-0.1-0.6-0.3c-0.2-0.1-0.4-0.3-0.6-0.5c-0.3-0.2-0.5-0.4-0.8-0.7c-0.2-0.3-0.5-0.6-0.7-1
c-0.2-0.4-0.4-0.9-0.5-1.4c0-0.3,0-0.5-0.1-0.8c0-0.3,0.1-0.5,0.1-0.8c0.1-0.3,0.1-0.5,0.2-0.7c0.1-0.3,0.2-0.5,0.3-0.7
c0.5-0.9,1.1-1.7,1.7-2.4c0.3-0.4,0.5-0.7,0.8-1.1c0.2-0.3,0.4-0.7,0.5-1c0.1-0.3,0.2-0.6,0.2-0.9c0.1-0.3,0-0.5,0-0.7
C39.7,7.2,39.6,7,39.6,7s0,0.1,0.1,0.2c0,0.1,0.2,0.3,0.2,0.5c0.1,0.2,0.2,0.5,0.2,0.8c0,0.3,0,0.7-0.1,1.1
c-0.2,0.8-0.6,1.6-1.1,2.4c-0.5,0.8-1.1,1.6-1.6,2.4c-0.1,0.2-0.2,0.4-0.3,0.6c-0.1,0.2-0.2,0.5-0.2,0.6c0,0.2-0.1,0.4-0.1,0.6
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C38.9,20.6,39.1,20.8,39.1,20.8z"/>
</g>
<g class="steam2">
<path class="st1" d="M25.9,17.9c0,0-0.2-0.1-0.6-0.3c-0.2-0.1-0.4-0.3-0.6-0.5c-0.3-0.2-0.5-0.4-0.8-0.7c-0.3-0.3-0.5-0.6-0.7-1
c-0.2-0.4-0.4-0.9-0.5-1.4c0-0.3,0-0.5-0.1-0.8c0-0.3,0.1-0.5,0.1-0.8c0.1-0.3,0.1-0.5,0.2-0.7c0.1-0.3,0.2-0.5,0.3-0.7
c0.5-0.9,1.1-1.7,1.7-2.4c0.3-0.4,0.5-0.7,0.7-1.1c0.2-0.3,0.4-0.7,0.5-1c0.1-0.3,0.2-0.6,0.2-0.9c0.1-0.3,0-0.5,0-0.7
c-0.1-0.4-0.1-0.7-0.1-0.7s0,0.1,0.1,0.2c0,0.1,0.2,0.3,0.2,0.5c0.1,0.2,0.2,0.5,0.2,0.8c0,0.3,0,0.7-0.1,1.1
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</g>
<g class="steam3">
<path class="st1" d="M32.5,22.5c0,0-0.2-0.1-0.6-0.3c-0.2-0.1-0.4-0.3-0.6-0.5c-0.3-0.2-0.5-0.4-0.8-0.7c-0.3-0.3-0.5-0.6-0.7-1
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</g>
</svg>
<script type=”text/javascript” src=”prefixfree.min.js”></script>
</body>
这是基于您的代码的快速入门：http : //codepen.io/anon/pen/rAdom?editors=101
首先，为动画定义关键帧：
@keyframes steaming {
0% {
transform: translateY(0px);
opacity: 0;
}
50% { opacity: 1; }
100% {
transform: translateY(-10px);
opacity: 0;
}
}
@-webkit-keyframes {
...
}
蒸汽将以不可见（不透明度：0）开始，然后淡入（不透明度：1），然后随着向上移动而返回，由translateY（-10px）确定。请注意，像素值是根据SVG视图框和高度/宽度值缩放的。
然后，使用您设置的类将这些关键帧应用于每个Steam SVG元素：
.steam1{
-webkit-animation: steaming 7s linear infinite;
-moz-animation: steaming 7s linear infinite;
animation: steaming 7s linear infinite;
}
您可以调整动画速度以使其看起来更好一些。
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